Sampling; Timeout Management - Zte ZXR10 5900E Series User Manual

ZXR10 5900E Series User Manual (Ethernet Switching Volume)
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vice type, contained packet number, byte number and other traffic
information can be performed statistics.
As a macro analysis tool for network communication, Netflow tech-
nology doesn't analyze the specific data contained in each packet
in network, instead it tests characteristics of transmitted data flow,
which enables Netflow technology with good scalability: support-
ing high-speed network port and large-scale telecom network.
As for processing mechanism, IPFIX introduces multi-level pro-
cessing procedures:
� In preprocessing stage, IPFIX can filter data flow of a specific
level or perform sampling to packets on high-speed network
interface based on demands of network management. With
IPFIX, processing load of network device can be relieved and
scalability of system can be enhanced while the needed man-
agement information is collected and performed statistics.
� In postprocessing stage, IPFIX can select to output all collected
original statistics of data flow to upper-layer server for data
sorting and summary; alternatively, network device can per-
form data aggregation to original statistics in various modes
and send the summary statistics result to upper layer man-
agement server. The latter one can reduce the data quantity
output by network device, thus decreasing requirement to con-
figuration of upper layer management server and promoting
scalability and working efficiency of upper layer management
system.
IPFIX outputs data in format of template. Network device will send
packet template and data flow records respectively to upper layer
management server when outputting data in IPFIX format. Packet
template specifies format and length of packet in subsequently
sent data flow record for management server processing subse-
quent packets. Meanwhile to avoid packet loss and errors in packet
transmission, network device repeats sending packet template to
upper layer management server regularly.

Sampling

IPFIX supports packet number-based sampling as well as time-
based sampling. Sampling rate can be configured on each inter-
face separately.

Timeout Management

As for collected flow data,
�
In case data are not updated within the inactive time, data will
be output to NM server;
� As for long time active flow, the data will also be output to NM
server after active time.